Cobalt oxide decorated zirconium oxide immobilized multiwalled carbon nanotubes as scaffolds for supercapacitors and the CO2 reduction reaction. (1st December 2021)

• Record Type: Journal Article
• Authors: Yadav, Dharmendra Kumar; Omar, Fatin Saiha; Yadav, Mamta; Ho, Xian Liang; Tessensohn, Malcolm E.; Ramesh, K.; Ramesh, S.; Webster, Richard D.; Ganesan, Vellaichamy
• Is Part Of: Journal of energy storage. Volume 44(2021)Part A
• Publication Date: 2021-12-01
• Subjects: Multiwalled carbon nanotubes -- Supercapacitors -- CO2 reduction -- Electrocatalysis; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2021.103312
• Languages: English
• ISSNs: 2352-152X

Abstract

Highlights: A bifunctional electrode material, MWCNTs-ZrO2 -Co3 O4 is synthesized and characterized. Using MWCNTs-ZrO2 -Co3 O4, an asymmetric supercapacitor is fabricated (MWCNTs-ZrO2 -Co3 O4 //AC). This device exhibits long-term cyclic stability and high specific energy. Electrocatalytic reduction of CO2 selectively to HCOOH is achieved using MWCNTs-ZrO2 -Co3 O4 . Abstract: In the field of renewable energy research, the development of materials for use as highly efficient supercapacitors and designing electrocatalytic materials for the reduction of CO2 to produce useful chemicals are envisaged as two important sustainable routes. However, developing stable, selective, and efficient materials for these purposes is a highly challenging task requiring numerous design attempts. In this work, cobalt oxide decorated zirconium oxide immobilized multiwalled carbon nanotubes (MWCNTs-ZrO2 -Co3 O4 ) is reported as a catalyst and battery electrode material for the electrochemical reduction of CO2 and supercapacitor applications, respectively. The MWCNTs-ZrO2 -Co3 O4 electrode assembled for the supercapacitor shows a specific capacity of 258.9 C/g at a current density of 1.0 A/g. The MWCNTs-ZrO2 -Co3 O4 and activated carbon (AC) based asymmetric supercapacitor (MWCNTs-ZrO2 -Co3 O4 //AC) displays specific energy in the range of 8.9 Wh/kg (at 837.2 W/kg) to 6.23 Wh/kg (at 1674.4 W/kg). The device, MWCNTs-ZrO2 -Co3 O4 //AC displays high cycling stability with 97% capacity retention after 7000 cycles at a current density of 1.0 A/g. In the electrocatalytic reduction of CO2, the MWCNTs-ZrO2 -Co3 O4 scaffold produces selectively formic acid during the electrolysis at -1.1 V ( vs. Ag/AgCl) in 0.1 M aqueous KCl solution. These results indicate that MWCNTs-ZrO2 -Co3 O4 can serve as a bifunctional material.